Egbert jabdine



` Nov. l5, 1927.

l R. JARDINE 649409 TAPPET AND METHOD OF MAKING SAME Filed Jan, 5. 1926 IlgL 3 7 6 F1g (AV r 2 fi -5- l i -E3 `3 i 2 l f i l i 4L 1 X" HIIIHHIHHIH I Patented Nov. 15, 1927.

UNITED STATES PATENT OFFICE.

ROBERT JARDINE. OF DETROIT, MICHIGAN', ASSIGNOR T0 RICH TOOL COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MAINE.

TAPPET AND METHOD OF MAKING SAME.

Application :filed January 5, 1926. Serial No. 79,361.

In the drawings:

Figure l is an elevational view, partially in section, of a wearing disk and the body portion of a tappet before forging them together;

Fig. 2 is an elevational view7 partially 1n section, of the body portion of the tappet shown in Fig. 1

Fig. 3 is a sectional elevational view of a Wearing disk;

Fig. 4 is a bottom plan view of thc disk shown in Fig. 3;

Fig. 5 is a sectional view of the tongue and slot connections between the wearing disk and the body portion of the tappetbefore forging such connections;

Fig. 6 is a sectional view similar to Fig. 5 and after forging the connections;

Fig. 7 is a sectional elevational view of a modified tappet before forging the body portion of the tappet to the wearing disk:

Fig. 8 is a sectional view similar to Fig. 7 and after forging the body portion of the tappet to the wearing disk;

Fig. 9 is a sectional elevational view of a modified form of the body portion of a tappet; and

Fig. 10 is a sectional elevational view of the tappet body shown in Fig. 9 forged in locking engagement with a wearing disk.

This invention relates to tappets which are operated by a cam shaft in an internal combustion engine to control the valves thereof, and it is an object of the invention to provide a tappet having a wearing disk of material adapted to be hardened and a body portion of a different type of metal. It is also an object of the invention to provide a tappet with a wearing disk composed of metal adapted to be hardened and having a forged dove-tail connection with the body portion of the tappet.

Referring to Figs. l to 6, inclusive, of the drawing, a tappet l is illustrated comprising a body portion 2 and a wearing disk 3. The body portion Q, which comprises a stem 4v and head 5` is composed of material which is easily machined. The wearing disk 3, however` is composed of material which may be hardened to withstand the wearing ac tionV of the cam in an internal combustion engine. The disk 3 may be composed of metal which may be forged such, for example,ae the sti-called high speed steel or tungsten steel or may be composed of metal which is not adapted to be `forged such, for example, as chilled white iron or unannealed malleable iron.

The disk 3 and the body portion of the tappet are preferably connected together by forged (upset) tongue and slot connections. Referring to Fig. 2. it should be noted the head 5 has a plurality of circular grooves 6 formed therein and an outside shoulder portion 7. The disk 3, as shown in Fig. 3, is provided with a plurality of circular grooves 8 which are adapted to tit the tongues or ridges forming the grooves 6 in the head 5 of the tappet body. The disk 3 is positioned in the top of the head 5 prior to a forging operation with the grooves 8 in the disk 3 and the ridges forming the grooves 6 in the head 5 in the position shown in Fig. 5 and also in Fig. l in the drawing. At this time the tongue and slot connections are not so locked as to insure against separation of the disk from the tappet body. Prior to the mounting of the disk in the head either the head is heated or the head and disk are heated for a forging operation. If the disk 3 is composed of material adapted to be forged, such as tungsten steel, then the head and disk are both heated.

The forging of the tongue and slot connections forces them to take a dove-tail shape such as shown in Fig. 6 of the drawing. Such dove-tail connections insure against any movement of the wearing disk in the head of the tappet and, moreover, insure against the falling out of portions of the disk in case it is cracked or broken. During the forging operation the shoulder 7 on the head v5 is pressed firmly into engagement with the disk As above set forth, the disk 3 may be connected to the body portion of the tappet when in a heated or in a cool condition. ln case the disk 3 is iu a cool condition. pronounced dove-tail shape ridges may not be formed in thatI part of the tongue and slot connections which are a part of the disk In such case wedge shaped grooves may be formed in the disk before it is forged if so desired.

Figs. 7 and 3 illustrate a modification of the invention wherein the body portion of the tappet is lightened and reduced some` what in weight. The body portion of the tappet comprises a stein l() having an open 'face ot the disk.

inp; 11 in the center thereof" and a head 12 which is preferably torniod as an integral part ot the stein 10. The head 12 .is cupshaped and is not provided with a plurality ot circular grooves as the head 5 shown in Figs. 1 and 2. A. disk 153, which is zulapted to lit in the head 12 as shown in Fig. T ot the drawing, is provided with a wedgeshaped projection 14 on the bottoni thereo't'. The disk 13 is provided Awith a` tapered side 15 adapted to be engaged by the shoulder Q5 on the head 12. The tapered side 15 andthe wedge-shaped projection 1st serve` to etl'ect dove-tail connection between the disk and the body portion ot the tappet after a torgingoperation. The disk 153 may bc :torined as a. casting' or inay be made ot metal adapted to be forged.

After assembling the disk 13 with the body portion of the tappet, the body portion is upset and forged tor securely itting` around the wearingdisk 13 to forni tongue and slot connection. as shown in Figi. 8 ot the dra-wing. rlhe metal termino; the head ot the body portion is upset to the projection 14tand to securely tit the sido 15 of the disk. Suitable threads 15 may be torined in the end ol'i the body portion for connection to a tappet rod.

In the inodii'ication sho n in Figs. Sl and 1() ot the drawing, the body portion 1i' coinprises a straight tube 18 haring` threads 1S) cut in the lower end thereo't. The wearing disk 2O is enlarged son'iewhat with respect. to the wearing` disk shown in Figs. 1 and 8 ot the drawing and has one circular Pjrooye 21 formed therein tor attaching' it to the body portion oft the tappeti. rllhe `groove 21 may be tapered or wedge-shaped, as indicated in Fig. 1() ot the drawing'. or may be torinod with sides perpendicular to the wearing sur- Sueh disk .may be nia de ot cast materialv which is adapted to be forged or may be made ot nieta] such as tungsten steel which is suitable :tor a forging' operation.. ln ease the disk .is made of torgible ,material itis not necessary to torni the `groove. 21 wedge-shaped. However.l it the disk Q0 is composed oit cast material, it desirable to torni. the groote 21 wedp'eshaped. The body portion o'lE the tappet is forged into engagement with the disk 2O as shown in Fig. 10 ot the drawing. rlhe instal torining the body port-ion ot' the tappet is upset and squeezed securely into the groove 21.

Vilhat clainied is;

1. il. tappet comprising a` disk composed of material adaptedto he hardened tor withstanding;` wear7 and e. body upset into interlocking engagement with a portion of said disk.

2. A. tappet comprisinga head and a body portion composed ot material adapted to be forged, and ak disk composed of a material adapted to be hardened to withstand wear7 session said disk having an upset dort-tail forged connection with said head.

3. A. tappet comprising a body portion composed oi" one type ot metal.7 a disk coinn posed ot a ditlerent type ot metal adapted to be hardened to withstand wear, and arv plun rality ot forged tongue and slot connections between the body portion and the disk.

L1. it. tappet comprising' a body portion hfwing,` a plurality ot grooves there-in7 and a disk composed ot material adapted to be hardened to insure against wear and having,l .grooves therein interlocked with the beforenientioned grooves, said interlockingY being elieeted by a forging operation.

5. A tappet coniprising a stein and a head ot one type of metal and a disk torined oit a nietal different troni vthe metal forming the stein and head, said disk having; a forged annular tongue and slot locking` engagement with said head.

G. A tappet comprising a stein haring a head thereon. scid head having a plurality ot grooves toi-ined therein and composed ot naterial adapted to be forged, and a disk having' grooves therein interlocked with the Q'roor in the head by a` toro-ing operation, said disk beine` composed ot material :adapted to be hardened to withstand wear.

T. method of 'formino` a tappet which consists in shaping a body portion ond a nearing; disk to have tongue and slot connection `with each other. and in upsetting' the connection to torni dove-tail engagement between the disk and the body portion ot the tappet. f

8. A niethod of torininn; a tappet which consists in shaping' a body portion and a wearing' disk to have a tongue und slot connection with each otherv and in upsetting;v the body portion while in engagement with the disk to 'torni a .fixed connect-ion between the disk and thc body portion.

9. A method ot `forming a tappet which consists in. toru'iinp; a head on a stein with a plurality oit' grooves therein. in :forming a plurality of grooves iu a disk oit material adapted to be hardened. in mounting; said disk on the head with the grooves in the head and disk interineshin and in tornino; said head and disk in enga jeinent with each other to forni a dove-tail connection between them.

10. A inethod ot torni' in" a tappet which consists in shaping; a body ineinber and a wearing; ineniber to haren tongue and `o rocwe connection with each other. and in conclu'-f rently so forging the conneiztiiid;v portions ot both said inenibers that the tongue on one n'ieinber is securely en'ibedded in the metal ot the other lneniber. said tongue boinrj so shaped as to insure a locking; erin-argomenta between the nieinbers. i y

ln witness whereof l have hereunto set my hand.

ROBERT Jill-BENE llt) 

